Jeryl Hollingsworth posted to Getty list that the most memorable
project for many of her fifth graders was the edible clay experience
they had as kindergartners. Since Jeryl is doing the clay this week
with kindergarten - she is making extra so her fifth graders can do it
again.

She gives each students a small bit of the three primary colors - and
two graham crackers so they can eat their creations when finished.

Blend the first four ingredients together and then mix in the powdered
sugar. Knead until smooth, adding more sugar if necessary to make a
sticky, pliable clay. The butter should be cold (don't prepare this
mixture on a hot day: the clay will be too soft to model). Divide the
ball of clay into small portions and mix in food coloring. Paste type
food colorings are recommended since they are more intense in color
than the liquid type (you can buy them in the craft section of
Wal-mart). Cut the edible clay into small pieces about the size of
marbles, so that each student will have two or three different colored
pieces.
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Many are looking for ideas that motivate for the end of the year.
Have fun with this one. There are probably many recipes online for
edible clay (I asked Jeryl for the one she uses - "tried and true").